Engineering Mathematics: New Applicationshttp://www.maplesoft.com/applications/category.aspx?cid=190
en-us2015 Maplesoft, A Division of Waterloo Maple Inc.Maplesoft Document SystemMon, 03 Aug 2015 00:33:24 GMTMon, 03 Aug 2015 00:33:24 GMTNew applications in the Engineering Mathematics categoryhttp://www.mapleprimes.com/images/mapleapps.gifEngineering Mathematics: New Applicationshttp://www.maplesoft.com/applications/category.aspx?cid=190
Circle Packing in an Ellipsehttp://www.maplesoft.com/applications/view.aspx?SID=153598&ref=Feed
<p>This application optimizes the packing of circles in an ellipse, such that the area of the ellipse is minimized. A typical solution is visualized here.</p>
<p>This is a difficult global optimization problem and demands strong solvers. This application uses Maple's <a href="/products/toolboxes/globaloptimization/">Global Optimization Toolbox</a>.</p>
<p>Circle packing (and packing optimization in general) is characterized by a large optimization space and many constraints; for this application, 35 circles generates 666 constraint equations.</p>
<p>The number of circles can be increased to create an increasingly complex problem; Maple automatically generates the symbolic constraint equations.</p>
<p>Applications like this are used to stress-test global optimizers.</p>
<p>The constraints and ellipse parameterization are taken from "Packing circles within ellipses", Birgin et al., International Transactions in Operational Research , Volume 20, Issue 3, pages 365&ndash;389, May 2013.</p><img src="/view.aspx?si=153598/5f52383daddaeb53aec548d14ebd6ce0.gif" alt="Circle Packing in an Ellipse" align="left"/><p>This application optimizes the packing of circles in an ellipse, such that the area of the ellipse is minimized. A typical solution is visualized here.</p>
<p>This is a difficult global optimization problem and demands strong solvers. This application uses Maple's <a href="/products/toolboxes/globaloptimization/">Global Optimization Toolbox</a>.</p>
<p>Circle packing (and packing optimization in general) is characterized by a large optimization space and many constraints; for this application, 35 circles generates 666 constraint equations.</p>
<p>The number of circles can be increased to create an increasingly complex problem; Maple automatically generates the symbolic constraint equations.</p>
<p>Applications like this are used to stress-test global optimizers.</p>
<p>The constraints and ellipse parameterization are taken from "Packing circles within ellipses", Birgin et al., International Transactions in Operational Research , Volume 20, Issue 3, pages 365&ndash;389, May 2013.</p>153598Wed, 04 Jun 2014 04:00:00 ZSamir KhanSamir KhanPacking Disks into a Circlehttp://www.maplesoft.com/applications/view.aspx?SID=153600&ref=Feed
<p>This application finds the best packing of unequal non-overlapping disks in a circular container, such that the radius of the container is minimized. This is a tough global optimization problem that demands strong solvers; this application uses Maple's <a href="/products/toolboxes/globaloptimization/">Global Optimization Toolbox</a>. You must have the Global Optimization Toolbox installed to use this application.</p>
<p>One solution for the packing of 50 disks with the integer radii 1 to 50 (as found by this application) is visualized here.</p>
<p>Other solutions for similar packing problems are documented at <a href="http://www.packomania.com">http://www.packomania.com</a>.</p>
<p>Packing optimization is industrially important, with applications in pallet loading, the arrangement of fiber optic cables in a tube, or the placing of components on a circuit board.</p><img src="/view.aspx?si=153600/32183b61c1bca332d0c71924ae09f73a.gif" alt="Packing Disks into a Circle" align="left"/><p>This application finds the best packing of unequal non-overlapping disks in a circular container, such that the radius of the container is minimized. This is a tough global optimization problem that demands strong solvers; this application uses Maple's <a href="/products/toolboxes/globaloptimization/">Global Optimization Toolbox</a>. You must have the Global Optimization Toolbox installed to use this application.</p>
<p>One solution for the packing of 50 disks with the integer radii 1 to 50 (as found by this application) is visualized here.</p>
<p>Other solutions for similar packing problems are documented at <a href="http://www.packomania.com">http://www.packomania.com</a>.</p>
<p>Packing optimization is industrially important, with applications in pallet loading, the arrangement of fiber optic cables in a tube, or the placing of components on a circuit board.</p>153600Wed, 04 Jun 2014 04:00:00 ZSamir KhanSamir KhanPacking Circles into a Trianglehttp://www.maplesoft.com/applications/view.aspx?SID=153596&ref=Feed
<p>This application finds the best packing and largest radius of equal-sized circles, such that they fit in a pre-defined triangle. One solution, as visualized by this application, is given below.</p>
<p>This is a difficult global optimization problem and demands strong solvers. This application uses Maple's <a href="http://www.maplesoft.com/products/toolboxes/globaloptimization/">Global Optimization Toolbox</a>.</p>
<p>Circle packing (and packing optimization in general) is characterized by a large optimization space and many constraints; for this application, 20 circles generates 310 constraint equations.</p>
<p>The number of circles can be increased to create an increasingly complex problem; Maple automatically generates the symbolic constraint equations. The vertices of the triangle can also be modified</p>
<p>Applications like this are used to stress-test global optimizers.</p><img src="/view.aspx?si=153596/2ac6ca1378717b3d939f3d8107616b35.gif" alt="Packing Circles into a Triangle" align="left"/><p>This application finds the best packing and largest radius of equal-sized circles, such that they fit in a pre-defined triangle. One solution, as visualized by this application, is given below.</p>
<p>This is a difficult global optimization problem and demands strong solvers. This application uses Maple's <a href="http://www.maplesoft.com/products/toolboxes/globaloptimization/">Global Optimization Toolbox</a>.</p>
<p>Circle packing (and packing optimization in general) is characterized by a large optimization space and many constraints; for this application, 20 circles generates 310 constraint equations.</p>
<p>The number of circles can be increased to create an increasingly complex problem; Maple automatically generates the symbolic constraint equations. The vertices of the triangle can also be modified</p>
<p>Applications like this are used to stress-test global optimizers.</p>153596Wed, 04 Jun 2014 04:00:00 ZSamir KhanSamir KhanCircle Packing in a Squarehttp://www.maplesoft.com/applications/view.aspx?SID=153599&ref=Feed
<p>This application optimizes the packing of circles (of varying radii) in a square, such that the side-length of the square is minimized.&nbsp; One solution for 20 circles (with integer radii of 1 to 20) is visualized here.</p>
<p>This is a difficult global optimization problem and demands strong solvers. This application uses Maple's <a href="/products/toolboxes/globaloptimization/">Global Optimization Toolbox</a>.</p>
<p>Circle packing (and packing optimization in general) is characterized by a large optimization space and many constraints; for this application, 20 circles generates 230 constraint equations.</p>
<p>The number of circles can be increased to create an increasingly complex problem; Maple automatically generates the symbolic constraint equations.</p>
<p>Applications like this are used to stress-test global optimizers.</p><img src="/view.aspx?si=153599/071f7b81258c5cad651a5030370d824f.gif" alt="Circle Packing in a Square" align="left"/><p>This application optimizes the packing of circles (of varying radii) in a square, such that the side-length of the square is minimized.&nbsp; One solution for 20 circles (with integer radii of 1 to 20) is visualized here.</p>
<p>This is a difficult global optimization problem and demands strong solvers. This application uses Maple's <a href="/products/toolboxes/globaloptimization/">Global Optimization Toolbox</a>.</p>
<p>Circle packing (and packing optimization in general) is characterized by a large optimization space and many constraints; for this application, 20 circles generates 230 constraint equations.</p>
<p>The number of circles can be increased to create an increasingly complex problem; Maple automatically generates the symbolic constraint equations.</p>
<p>Applications like this are used to stress-test global optimizers.</p>153599Wed, 04 Jun 2014 04:00:00 ZSamir KhanSamir KhanAutomatic Speech Segmentationhttp://www.maplesoft.com/applications/view.aspx?SID=153553&ref=Feed
<p>This worksheet demonstrates the use of the Forward-Backward Divergence model (FBD) in Automatic Speech Segmentation, and how it detects discontinuities in the voice signal. It illustrates in the example below how it is possible to enlarge some segments of the speech (vowels enlargement for instance). To realize this result, it is possible to visually and acoustically perceive the stationary segments of the speech signal.</p><img src="/view.aspx?si=153553/speech.png" alt="Automatic Speech Segmentation" align="left"/><p>This worksheet demonstrates the use of the Forward-Backward Divergence model (FBD) in Automatic Speech Segmentation, and how it detects discontinuities in the voice signal. It illustrates in the example below how it is possible to enlarge some segments of the speech (vowels enlargement for instance). To realize this result, it is possible to visually and acoustically perceive the stationary segments of the speech signal.</p>153553Thu, 17 Apr 2014 04:00:00 ZJocelyn MagneJocelyn MagneWavelet analysis of the blood pressure and pulse frequency measurements with Maplehttp://www.maplesoft.com/applications/view.aspx?SID=149420&ref=Feed
<p>A significant part of medical signals, or observations, is non-stationary, discrete time sequences. Thus, the computer methods analysis, as well as refinement and compression, are very helpful as for the problems of recognition and detection of their key diagnostic features. We are going to illustrate here this statement with examples of very common, and even routine medical measurements of blood pressure as well as pulse rate and with possibilities of Maple.<br />The package of Discrete Wavelet transforms (DWT) within Maple 16 [1] was recently added as new research software just for such tasks. The practical testing of this package was additional goal of present study.</p><img src="/view.aspx?si=149420/4b9024ee653d2c7be8febb717b1df52a.gif" alt="Wavelet analysis of the blood pressure and pulse frequency measurements with Maple" align="left"/><p>A significant part of medical signals, or observations, is non-stationary, discrete time sequences. Thus, the computer methods analysis, as well as refinement and compression, are very helpful as for the problems of recognition and detection of their key diagnostic features. We are going to illustrate here this statement with examples of very common, and even routine medical measurements of blood pressure as well as pulse rate and with possibilities of Maple.<br />The package of Discrete Wavelet transforms (DWT) within Maple 16 [1] was recently added as new research software just for such tasks. The practical testing of this package was additional goal of present study.</p>149420Sun, 14 Jul 2013 04:00:00 ZIrina A. DanishewskaIrina A. DanishewskaHardening of Aluminium Alloy AA 7075 T 7351http://www.maplesoft.com/applications/view.aspx?SID=140361&ref=Feed
<p><span id="ctl00_mainContent__documentViewer"><span><span class="body summary">This worksheet is concerned with the hardening of aluminium alloy, the behaviour of which can be expressed by a simple power law with two hardening parameters. Based upon experimental data these parameters have been determined by both a linear regrssion and the nonlinear <em>MARQUARDT-LEVENBERG algorithm.</em></span></span></span></p><img src="/applications/images/app_image_blank_lg.jpg" alt="Hardening of Aluminium Alloy AA 7075 T 7351" align="left"/><p><span id="ctl00_mainContent__documentViewer"><span><span class="body summary">This worksheet is concerned with the hardening of aluminium alloy, the behaviour of which can be expressed by a simple power law with two hardening parameters. Based upon experimental data these parameters have been determined by both a linear regrssion and the nonlinear <em>MARQUARDT-LEVENBERG algorithm.</em></span></span></span></p>140361Wed, 14 Nov 2012 05:00:00 ZJosef BettenJosef BettenClassroom Tips and Techniques: Fourier Series and an Orthogonal Expansions Packagehttp://www.maplesoft.com/applications/view.aspx?SID=134198&ref=Feed
The OrthogonalExpansions package contributed to the Maple Application Center by Dr. Sergey Moiseev is considered as a tool for generating a Fourier series and its partial sums. This package provides commands for expansions in 17 other bases of orthogonal functions. In addition to looking at the Fourier series option, this article also considers the Bessel series expansion.<img src="/view.aspx?si=134198/thumb.jpg" alt="Classroom Tips and Techniques: Fourier Series and an Orthogonal Expansions Package" align="left"/>The OrthogonalExpansions package contributed to the Maple Application Center by Dr. Sergey Moiseev is considered as a tool for generating a Fourier series and its partial sums. This package provides commands for expansions in 17 other bases of orthogonal functions. In addition to looking at the Fourier series option, this article also considers the Bessel series expansion.134198Mon, 14 May 2012 04:00:00 ZDr. Robert LopezDr. Robert LopezSolving Equations with Maplehttp://www.maplesoft.com/applications/view.aspx?SID=130644&ref=Feed
<p>This worksheet is concerned with methods implemented in Maple to solve some equations of several types.</p>
<p>&nbsp;&nbsp; For instance, the procedures&nbsp; <strong>fsolve&nbsp; </strong>and&nbsp; <strong>RootOf&nbsp; </strong>are very effective and should be used in the following examples.</p>
<p>&nbsp;</p>
<p><em>Keywords:&nbsp; </em>fsolve, RootOf, polynomials of degree&nbsp; n &gt; 3, orthopoly, <em>HERMITE, LEGENDRE,&nbsp;</em></p>
<p><em>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LAGUERRE, CHEBYSHEV, </em>transcendental equations</p>
<p>&nbsp;</p>
<p><em><br /></em></p><img src="/applications/images/app_image_blank_lg.jpg" alt="Solving Equations with Maple" align="left"/><p>This worksheet is concerned with methods implemented in Maple to solve some equations of several types.</p>
<p>&nbsp;&nbsp; For instance, the procedures&nbsp; <strong>fsolve&nbsp; </strong>and&nbsp; <strong>RootOf&nbsp; </strong>are very effective and should be used in the following examples.</p>
<p>&nbsp;</p>
<p><em>Keywords:&nbsp; </em>fsolve, RootOf, polynomials of degree&nbsp; n &gt; 3, orthopoly, <em>HERMITE, LEGENDRE,&nbsp;</em></p>
<p><em>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LAGUERRE, CHEBYSHEV, </em>transcendental equations</p>
<p>&nbsp;</p>
<p><em><br /></em></p>130644Mon, 13 Feb 2012 05:00:00 ZProf. Josef BettenProf. Josef BettenClassroom Tips and Techniques: An Undamped Coupled Oscillatorhttp://www.maplesoft.com/applications/view.aspx?SID=129521&ref=Feed
<p>Even for just three degrees of freedom, an undamped coupled oscillator modeled by the ODE system <em>M</em> &uuml; + <em>K</em> u = 0 is difficult to solve analytically because, ultimately, a cubic characteristic equation has to be solve exactly. Instead, we simultaneously diagonalize <em>M</em> and <em>K</em>, the mass and stiffness matrices, thereby uncoupling the equations, and obtaining an explicit solution.</p><img src="/view.aspx?si=129521/thumb.jpg" alt="Classroom Tips and Techniques: An Undamped Coupled Oscillator" align="left"/><p>Even for just three degrees of freedom, an undamped coupled oscillator modeled by the ODE system <em>M</em> &uuml; + <em>K</em> u = 0 is difficult to solve analytically because, ultimately, a cubic characteristic equation has to be solve exactly. Instead, we simultaneously diagonalize <em>M</em> and <em>K</em>, the mass and stiffness matrices, thereby uncoupling the equations, and obtaining an explicit solution.</p>129521Tue, 10 Jan 2012 05:00:00 ZDr. Robert LopezDr. Robert LopezClassroom Tips and Techniques: Simultaneous Diagonalization and the Generalized Eigenvalue Problemhttp://www.maplesoft.com/applications/view.aspx?SID=128444&ref=Feed
<p>This article explores the connections between the generalized eigenvalue problem and the problem of simultaneously diagonalizing a pair of <em>n &times; n</em> matrices.</p>
<p>Given the <em>n &times; n</em> matrices <em>A</em> and <em>B</em>, the <em>generalized eigenvalue problem</em> seeks the eigenpairs <em>(lambda<sub>k</sub>, x<sub>k</sub>)</em>, solutions of the equation <em>Ax = lambda Bx</em>, or <em>(A - lambda B) x = 0</em>. If <em>B</em> is nonsingular, the eigenpairs of <em>B<sup>-1</sup> A</em> are solutions. If a matrix <em>S</em> exists for which<em> S<sup>T</sup> A S = Lambda</em>, and <em>S<sup>T</sup> B S = I</em>, where <em>Lambda</em> is a diagonal matrix and <em>I</em> is the <em>n &times; n</em> identity, then <em>A</em> and <em>B</em> are said to be <em>diagonalized simultaneously</em>, in which case the diagonal entries of <em>Lambda</em> are the generalized eigenvalues for <em>A</em> and <em>B</em>. Such a matrix <em>S</em> exists if <em>A</em> is symmetric and <em>B</em> is positive definite. (Our definition of positive definite includes symmetry.)</p><img src="/view.aspx?si=128444/thumb.jpg" alt="Classroom Tips and Techniques: Simultaneous Diagonalization and the Generalized Eigenvalue Problem" align="left"/><p>This article explores the connections between the generalized eigenvalue problem and the problem of simultaneously diagonalizing a pair of <em>n &times; n</em> matrices.</p>
<p>Given the <em>n &times; n</em> matrices <em>A</em> and <em>B</em>, the <em>generalized eigenvalue problem</em> seeks the eigenpairs <em>(lambda<sub>k</sub>, x<sub>k</sub>)</em>, solutions of the equation <em>Ax = lambda Bx</em>, or <em>(A - lambda B) x = 0</em>. If <em>B</em> is nonsingular, the eigenpairs of <em>B<sup>-1</sup> A</em> are solutions. If a matrix <em>S</em> exists for which<em> S<sup>T</sup> A S = Lambda</em>, and <em>S<sup>T</sup> B S = I</em>, where <em>Lambda</em> is a diagonal matrix and <em>I</em> is the <em>n &times; n</em> identity, then <em>A</em> and <em>B</em> are said to be <em>diagonalized simultaneously</em>, in which case the diagonal entries of <em>Lambda</em> are the generalized eigenvalues for <em>A</em> and <em>B</em>. Such a matrix <em>S</em> exists if <em>A</em> is symmetric and <em>B</em> is positive definite. (Our definition of positive definite includes symmetry.)</p>128444Tue, 06 Dec 2011 05:00:00 ZDr. Robert LopezDr. Robert LopezShock Response Spectrumhttp://www.maplesoft.com/applications/view.aspx?SID=125009&ref=Feed
<p>This worksheet calculates the shock response spectrum based on some input data.</p><img src="/view.aspx?si=125009/SRS.jpg" alt="Shock Response Spectrum" align="left"/><p>This worksheet calculates the shock response spectrum based on some input data.</p>125009Mon, 22 Aug 2011 04:00:00 ZSurak PereraSurak PereraSignal Processing in Maplehttp://www.maplesoft.com/applications/view.aspx?SID=102646&ref=Feed
Consider the problem of evaluating the impact of a structure against a hard surface. The resulting acceleration will typically consist of the actual physical transient acceleration signal plus high frequency sensor resonance. Below we define a few simple analytical functions to model these responses. The effect of adjusting the sampling rate will be explored.<img src="/view.aspx?si=102646/thumb.jpg" alt="Signal Processing in Maple" align="left"/>Consider the problem of evaluating the impact of a structure against a hard surface. The resulting acceleration will typically consist of the actual physical transient acceleration signal plus high frequency sensor resonance. Below we define a few simple analytical functions to model these responses. The effect of adjusting the sampling rate will be explored.102646Fri, 18 Mar 2011 04:00:00 ZMaplesoftMaplesoftHarmonic Analysishttp://www.maplesoft.com/applications/view.aspx?SID=96900&ref=Feed
<p>Harmonic Analysis combines innovative numerical tools for signal processing with rich analytical tools for studying problems of physics and the mathematics of complex variables. Harmonic Analysis provides a Maple package with worked examples in signal filtering, finance, and conformal mapping. The rich documentation includes an in-depth explanation of the theory of harmonic analysis. <br /> <br /> The algorithms in Harmonic Analysis are the culmination of new research by the author in the field of harmonic analysis. They have a US Patent pending (#10/856,453), and a paper on the methods behind the technology is published in the September 2004 issue of IEEE Explorer.</p><img src="/view.aspx?si=96900/harmoniclogo.gif" alt="Harmonic Analysis" align="left"/><p>Harmonic Analysis combines innovative numerical tools for signal processing with rich analytical tools for studying problems of physics and the mathematics of complex variables. Harmonic Analysis provides a Maple package with worked examples in signal filtering, finance, and conformal mapping. The rich documentation includes an in-depth explanation of the theory of harmonic analysis. <br /> <br /> The algorithms in Harmonic Analysis are the culmination of new research by the author in the field of harmonic analysis. They have a US Patent pending (#10/856,453), and a paper on the methods behind the technology is published in the September 2004 issue of IEEE Explorer.</p>96900Wed, 15 Sep 2010 04:00:00 ZVladimir ClueVladimir ClueDesign of logarithmic spiral gear by closed complex function in to DXF formathttp://www.maplesoft.com/applications/view.aspx?SID=95483&ref=Feed
The present worksheet deals with the complex algebraic representation of the gear tooth contact principles. The formulae deduced with the help of Maple software environment&nbsp; are closed form solution equations of the contact gear profile to a given rack profile. The worksheet make the final result of gear contour in DXF formatum directly.<img src="/view.aspx?si=95483/278843\30d63f44452b5fdc481d0e802c3751be.gif" alt="Design of logarithmic spiral gear by closed complex function in to DXF format" align="left"/>The present worksheet deals with the complex algebraic representation of the gear tooth contact principles. The formulae deduced with the help of Maple software environment&nbsp; are closed form solution equations of the contact gear profile to a given rack profile. The worksheet make the final result of gear contour in DXF formatum directly.95483Tue, 27 Jul 2010 04:00:00 ZDr. Laczik BálintDr. Laczik BálintCalculate time differencehttp://www.maplesoft.com/applications/view.aspx?SID=35404&ref=Feed
<p>This small application calculates the difference between two given time points.</p><img src="/applications/images/app_image_blank_lg.jpg" alt="Calculate time difference" align="left"/><p>This small application calculates the difference between two given time points.</p>35404Tue, 20 Apr 2010 04:00:00 ZHarald KammererHarald KammererConstruction and movement of the centrodes of a slider crank mechanismhttp://www.maplesoft.com/applications/view.aspx?SID=35401&ref=Feed
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<p class="MsoNormal"><span lang="EN-US">The movement of the general planar linkage mechanism with one degree of freedom matches exactly the rolling of two centrode curves on each other without slipping.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The first centrode is fixed to the frame of the linkage and the second centrode is fixed to the moving element of the mechanism.<o:p></o:p></span></p>
<p><span lang="EN-US">The example illustrates the analytic calculation and geometric construction of the centrodes for a slider crank mechanism.</span></p><img src="/view.aspx?si=35401/0\images\linkmech_1.gif" alt="Construction and movement of the centrodes of a slider crank mechanism" align="left"/><p>
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<p class="MsoNormal"><span lang="EN-US">The movement of the general planar linkage mechanism with one degree of freedom matches exactly the rolling of two centrode curves on each other without slipping.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The first centrode is fixed to the frame of the linkage and the second centrode is fixed to the moving element of the mechanism.<o:p></o:p></span></p>
<p><span lang="EN-US">The example illustrates the analytic calculation and geometric construction of the centrodes for a slider crank mechanism.</span></p>35401Mon, 19 Apr 2010 04:00:00 ZDr. Laczik BálintDr. Laczik BálintQuaternions, Octonions and Sedenionshttp://www.maplesoft.com/applications/view.aspx?SID=35196&ref=Feed
<p>This Hypercomplex package provides the algebra of the quaternion, octonion and sedenion hypercomplex numbers.</p><img src="/applications/images/app_image_blank_lg.jpg" alt="Quaternions, Octonions and Sedenions" align="left"/><p>This Hypercomplex package provides the algebra of the quaternion, octonion and sedenion hypercomplex numbers.</p>35196Fri, 16 Apr 2010 04:00:00 ZDr. Michael Angel CarterDr. Michael Angel CarterFracture Propogation in the Internal Pressurized Vesselhttp://www.maplesoft.com/applications/view.aspx?SID=35194&ref=Feed
<p>** Abstract : -Calculating the maximum value Pmax that causes the fracture propagation while applying the internal static pressure . -Evaluating the time-limit for applying the continous / discrete form of internal dynamic pressure for the round metal vessel under conditions given by series expansion and curve -fitting method . ** Subjects: Fracture Mechanics , The stress intensity factor KI . This worksheet demonstrates Maple's capabilities in estimating the maximum pressure and the time-limit for applying static or dynamic pressure on the surface of a round metal vessel which has an internal semi-elliptical surface crack .</p><img src="/view.aspx?si=35194/thumb.jpg" alt="Fracture Propogation in the Internal Pressurized Vessel" align="left"/><p>** Abstract : -Calculating the maximum value Pmax that causes the fracture propagation while applying the internal static pressure . -Evaluating the time-limit for applying the continous / discrete form of internal dynamic pressure for the round metal vessel under conditions given by series expansion and curve -fitting method . ** Subjects: Fracture Mechanics , The stress intensity factor KI . This worksheet demonstrates Maple's capabilities in estimating the maximum pressure and the time-limit for applying static or dynamic pressure on the surface of a round metal vessel which has an internal semi-elliptical surface crack .</p>35194Sat, 20 Feb 2010 05:00:00 ZDr. Co TranDr. Co TranViscoplastic Materialshttp://www.maplesoft.com/applications/view.aspx?SID=35104&ref=Feed
<p>Abstract</p>
<p>This worksheet is concerned with the <em>linear </em>and <em>nonlinear </em>theory of viscoplasticity. For example, in the following the rate-dependent deformation of a Fe-0.05 weight percent carbon steel at temperatures in excess of a homologous temperature of 0.5 has been discussed in coparison with suitable experiments.</p>
<p>&nbsp;&nbsp; In order to describe the tensile tests at elevated temperatures, a viscoplastic constitutive eqution with three parametrs has been proposed. These parameters can be determined by using the <em>LEVENBERG-MARQUARDT algorithm.</em></p>
<p>&nbsp;</p>
<p><em>Keywords:&nbsp; </em>linear and nomlinear viscoplasticity; tensile tests at elevated temperature; viscoplastic constitutive equation; parameter identification; L-one and L-two error norms &nbsp;&nbsp;&nbsp;&nbsp;</p>
<p>&nbsp;</p><img src="/view.aspx?si=35104/thumb.jpg" alt="Viscoplastic Materials" align="left"/><p>Abstract</p>
<p>This worksheet is concerned with the <em>linear </em>and <em>nonlinear </em>theory of viscoplasticity. For example, in the following the rate-dependent deformation of a Fe-0.05 weight percent carbon steel at temperatures in excess of a homologous temperature of 0.5 has been discussed in coparison with suitable experiments.</p>
<p>&nbsp;&nbsp; In order to describe the tensile tests at elevated temperatures, a viscoplastic constitutive eqution with three parametrs has been proposed. These parameters can be determined by using the <em>LEVENBERG-MARQUARDT algorithm.</em></p>
<p>&nbsp;</p>
<p><em>Keywords:&nbsp; </em>linear and nomlinear viscoplasticity; tensile tests at elevated temperature; viscoplastic constitutive equation; parameter identification; L-one and L-two error norms &nbsp;&nbsp;&nbsp;&nbsp;</p>
<p>&nbsp;</p>35104Wed, 27 Jan 2010 05:00:00 ZProf. Josef BettenProf. Josef Betten